underbrefin 

Talking unde your breath

Dont be underbrefin while you walking away. I’m

underbrefin by Manymomofmany August 4, 2019

underbrained 

1. The utter failure to employ sufficient intelligence in any given context

2. Acutely lacking sufficient intelligence for use in any given context

Esp. in positions of social responsibility/power.

e.g. Kit on Palin: "That woman is dangerously underbrained"

underbrained by Føx January 19, 2011